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    <title>zpch1</title>
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    <center>Scilab Function</center>
    <div align="right">Last update : April 1993</div>
    <p>
      <b>zpch1</b> -  Chebyshev analog filter</p>
    <h3>
      <font color="blue">Calling Sequence</font>
    </h3>
    <dl>
      <dd>
        <tt>[poles,gain]=zpch1(n,epsilon,omegac)  </tt>
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    <h3>
      <font color="blue">Parameters</font>
    </h3>
    <ul>
      <li>
        <tt>
          <b>n</b>
        </tt>: integer (filter order)</li>
      <li>
        <tt>
          <b>epsilon</b>
        </tt>: real : ripple in the pass band (<tt>
          <b>0&lt;epsilon&lt;1</b>
        </tt>)</li>
      <li>
        <tt>
          <b>omegac</b>
        </tt>: real : cut-off frequency in Hertz</li>
      <li>
        <tt>
          <b>poles</b>
        </tt>: resulting filter poles</li>
      <li>
        <tt>
          <b>gain</b>
        </tt>: resulting filter gain</li>
    </ul>
    <h3>
      <font color="blue">Description</font>
    </h3>
    <p>
    Poles of a Type 1 Chebyshev analog filter. The transfer function is given by :</p>
    <pre>

 H(s)=gain/poly(poles,'s')
   
    </pre>
    <h3>
      <font color="blue">Author</font>
    </h3>
    <p>F.D.  </p>
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